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lpar_map.h

/*
 * Copyright (C) 2001  Mike Corrigan IBM Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */
#ifndef _ASM_POWERPC_ISERIES_LPAR_MAP_H
#define _ASM_POWERPC_ISERIES_LPAR_MAP_H

#ifndef __ASSEMBLY__

#include <asm/types.h>

#endif

/*
 * The iSeries hypervisor will set up mapping for one or more
 * ESID/VSID pairs (in SLB/segment registers) and will set up
 * mappings of one or more ranges of pages to VAs.
 * We will have the hypervisor set up the ESID->VSID mapping
 * for the four kernel segments (C-F).  With shared processors,
 * the hypervisor will clear all segment registers and reload
 * these four whenever the processor is switched from one
 * partition to another.
 */

/* The Vsid and Esid identified below will be used by the hypervisor
 * to set up a memory mapping for part of the load area before giving
 * control to the Linux kernel.  The load area is 64 MB, but this must
 * not attempt to map the whole load area.  The Hashed Page Table may
 * need to be located within the load area (if the total partition size
 * is 64 MB), but cannot be mapped.  Typically, this should specify
 * to map half (32 MB) of the load area.
 *
 * The hypervisor will set up page table entries for the number of
 * pages specified.
 *
 * In 32-bit mode, the hypervisor will load all four of the
 * segment registers (identified by the low-order four bits of the
 * Esid field.  In 64-bit mode, the hypervisor will load one SLB
 * entry to map the Esid to the Vsid.
*/

#define HvEsidsToMap    2
#define HvRangesToMap   1

/* Hypervisor initially maps 32MB of the load area */
#define HvPagesToMap    8192

#ifndef __ASSEMBLY__
00062 struct LparMap {
      u64   xNumberEsids;     // Number of ESID/VSID pairs
      u64   xNumberRanges;    // Number of VA ranges to map
      u64   xSegmentTableOffs; // Page number within load area of seg table
      u64   xRsvd[5];
      struct {
            u64   xKernelEsid;      // Esid used to map kernel load
            u64   xKernelVsid;      // Vsid used to map kernel load
      } xEsids[HvEsidsToMap];
      struct {
            u64   xPages;           // Number of pages to be mapped
            u64   xOffset;    // Offset from start of load area
            u64   xVPN;       // Virtual Page Number
      } xRanges[HvRangesToMap];
};

extern const struct LparMap   xLparMap;

#endif /* __ASSEMBLY__ */

/* the fixed address where the LparMap exists */
#define LPARMAP_PHYS          0x7000

#endif /* _ASM_POWERPC_ISERIES_LPAR_MAP_H */

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